Volume 52 (5): 701-704, 2004 Copyright ©The Histochemical Society, Inc.
Uptake of a Fluorescent Dye as a Swift and Simple Indicator of Organelle Intactness : Import-competent Chloroplasts from Soil-grown Arabidopsis
Plant Biochemistry Laboratory (JK,HVS,AM) and Plant Anatomy and Physiology Laboratory (AS), The Royal Veterinary and Agricultural University, Copenhagen, Denmark Correspondence to: Alexandra Mant, Plant Biochemistry Laboratory, The Royal Veterinary & Agricultural University, 40, Thorvaldsensvej, DK-1871 Frederiksberg C, Copenhagen, Denmark. E-mail: ama{at}kvl.dk We developed a rapid and reliable technique for specifically staining intact chloroplasts using the fluorescent dye carboxyfluorescein diacetate. Intact, import-competent chloroplasts were isolated simply and rapidly from soil-grown Arabidopsis thaliana plants, with yields of 20 ± 5 µg chlorophyll per g FW, greater than previously reported yields from soil-grown Arabidopsis. Traditional chloroplast isolation buffers sometimes contain low concentrations (<10 mM) sodium ascorbate as a general-purpose anti-oxidant, but we found that only Arabidopsis chloroplasts isolated in the presence of high concentrations (50100 mM) of sodium ascorbate in the initial grinding buffer were import-competent. (J Histochem Cytochem 52:701704, 2004)
Key Words: carboxyfluorescein diacetate intact organelles Arabidopsis chloroplast glucosinolates protein import
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